Certificate Validation Flaw Could Enable Identity Spoofing

Reason for Revision:
The original version of this bulletin was released on 05 September 2002. On 09 September 2002, we updated the bulletin to advise customers that a Microsoft-issued digital certificate, used to sign device drivers, did not meet the stricter validation standards established by the patch. As a result, customers who installed the patch could see unexpected error messages when installing new hardware, or in some cases might be unable to install new hardware altogether. On 20 November 2002, we released an updated version of the patch that not only eliminates this problem, but also eliminates a newly discovered variant of the original vulnerability.